Main Relay (Computer/Fuel System): Testing and Inspection

EFI Main Relay Circuit Diagram:

Circuit Diagram

EFI Main Relay Inspection:

Inspect Relay Continuity
- Check that there is continuity between terminals 3 and 4.
- Check that there is no continuity between terminals 1 and 2.
- If continuity is not as specified, replace the relay.

EFI Main Relay Inspection- Checking Operation:

Inspect Relay Operation
- Apply battery voltage across terminals 3 and 4.
- Check that there is continuity between terminals 1 and 2.
- If operation is not as specified, replace the relay.